Thermodynamic Theory

Rossetti, George A.

doi:10.1007/978-3-540-68683-5_22

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…This point of view is adopted in this study and the consequences for the features of phase diagrams that display morphotropic boundaries are systematically investigated. A thermodynamic analysis of the crystallographic anisotropy of polarization in systems with MPBs is developed using the Landau theory of phase transitions, wherein composition as a variable of state is explicitly taken into account . This study is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of Ferroelectric Solid Solutions with Morphotropic Phase Boundaries

2014

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A thermodynamic analysis is presented for the diffusionless phase diagrams of ferroelectric solid solutions that display a morphotropic phase boundary (MPB) separating adjacent tetragonal and rhombohedral phases. Equations are developed for the shape of the MPB, the locations of triple and tricritical points, and for the line along which the anisotropy of polarization vanishes. The appearance of lower symmetry orthorhombic and monoclinic phases is considered and the topologies of energy surfaces in the region of the phase diagram where these phases may stabilize are illustrated. The theory is applied to the solid solution of lead zirconate with lead titanate (PZT) and relationships between polar anisotropy and the transformation strain, dielectric susceptibility and piezoelectric properties, are discussed. The analysis is used to reproduce phase boundary lines for solid solutions of lead titanate with lead magnesium niobate (PMN‐PT) and lead zinc niobate (PZN‐PT) and composition–temperature diagrams along isopleths in the ternary system PMN‐PZT are estimated. The anisotropies of polarization in solid solutions based on lead titanate and barium titanate are contrasted. The results provide a thermodynamic framework useful for guiding experimental investigations of ferroelectric solid solutions and for generating energy functions used in constitutive modeling and phase field simulations of microstructure and properties.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics of Ferroelectric Solid Solutions with Morphotropic Phase Boundaries

2014

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“…An introduction to the phenomenological theory as applied to ferroelectric compounds and solid solutions is given in Ref. 181.…”

Section: Challenges For Modeling Of Complex Oxide Heterostructuresmentioning

confidence: 99%

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

Subramanyam¹,

Cole²,

Sun³

et al. 2013

Journal of Applied Physics

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147

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There has been significant progress on the fundamental science and technological applications of complex oxides and multiferroics. Among complex oxide thin films, barium strontium titanate (BST) has become the material of choice for room-temperature-based voltage-tunable dielectric thin films, due to its large dielectric tunability and low microwave loss at room temperature. BST thin film varactor technology based reconfigurable radio frequency (RF)/microwave components have been demonstrated with the potential to lower the size, weight, and power needs of a future generation of communication and radar systems. Low-power multiferroic devices have also been recently demonstrated. Strong magneto-electric coupling has also been demonstrated in different multiferroic heterostructures, which show giant voltage control of the ferromagnetic resonance frequency of more than two octaves. This manuscript reviews recent advances in the processing, and application development for the complex oxides and multiferroics, with the focus on voltage tunable RF/microwave components. The over-arching goal of this review is to provide a synopsis of the current state-of the-art of complex oxide and multiferroic thin film materials and devices, identify technical issues and technical challenges that need to be overcome for successful insertion of the technology for both military and commercial applications, and provide mitigation strategies to address these technical challenges. V C 2013 AIP Publishing LLC.

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Thermodynamic Theory

Cited by 2 publications

References 34 publications

Thermodynamics of Ferroelectric Solid Solutions with Morphotropic Phase Boundaries

Thermodynamics of Ferroelectric Solid Solutions with Morphotropic Phase Boundaries

Challenges and opportunities for multi-functional oxide thin films for voltage tunable radio frequency/microwave components

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